解析 B。选项 A“count the number of books in the room”数房间里书的数量不是用显微镜的目的。选项 C“listen to music”听音乐与显微镜毫无关系。选项 D“calculate the area of a rectangle”计算矩形面积也不用显微镜。在生物学实验中,使用显微镜是为了观察微小的生物体和结构。
Photography through a microscope Amateur microscopes and cheap cameras A simple toy microscope and a disposable camera can team up to make stunning photographs of very tiny things. The technique is simplicity itself. You simply focus the microscope carefully by eye as you would normally do. Then...
A. put the specimen directly under the microscope B. cut the specimen into very large pieces C. fix and stain the specimen D. wash the specimen with hot water 相关知识点: 试题来源: 解析 C。解析:在生物实验准备显微镜观察的标本时,首先需要固定和染色标本。A选项直接把标本放在显微镜下是错误的,...
eyepiece: The lens at the top of a microscope that the user looks through. focusing knob: A part of the microscope used to adjust the focus of the image being viewed. objective lens: The lens on a microscope that is closest to the specimen, wh...
Female medical Doctor or research scientist looking through a microscope in a laboratory.science experiments laboratory glassware containing chemical liquid for researching biology chemistry samples,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包
A the degree of sharpness produced by the microscope B the greatest distance between two objects visible in the same field of view C the minimum distance that allows two objects to be viewed as separate D the size of the smallest object visible using the microscope 2 The electron micrograph ...
A slice through a tomogram of Wuhan strain virions shown in Fig. 1a, b is typical of three independent preparations of the virus. The virions are randomly oriented within the ice layer and therefore a variety of oblique sections through the virions are observed in each slice of the ...
Moreover, the details are limited to the spatial resolution of the optical microscope, resulting in identifying changes that have already manifested or are at a relatively advanced stage of progression. Some fluorescence labeling can also offer chemical information through condition-bound fluorescence ...
. Smaller elements, such as individual proteins and protein complexes, can’t be seen through a microscope. Biochemistry techniques, which start with a single protein, allow scientists to get down to the nanometer scale. (A nanometer is one-billionth of a meter, or 1/1,000th of a mic...
He thus suspected (but did not see) the presence of capillaries; he thought, however, that the blood changed into air, or pneuma, when it reached the arteries, to be pumped throughout the body. Perhaps the last of the ancient biological scientists of note was Galen of Pergamum, a Greek...